Belgium belongs to the eurozone. Scroll down to related links and look at "Eurozone - Wikipedia".
Yes
they have Euros
euros
You can indeed,and if you desire you can exchange the euros for pounds.
£9.75
they use euros but it depends what you're buying.....
Google it, "10 euros to pounds"
30 euros into pounds
230 Euros = 200.975453 British pounds.
Euros
90 euros = 75.614 pounds
the Scottish use pounds unlike Ireland who use euros